-er -ic c-- ccc cce cci cck cco ccr ccs cct ce- cec cee cei cek ceo cer ces cet ci- cic cie cii cik cio cir cis cit ckc cki cko cks ckt co- coc coe coi cok coo cor cos cot crc cre cri crk cro crr crs crt csc cse csi csk cso csr css cst ctc cte cti ctk cto ctr cts ctt ec- ecc ece eci eck eco ecr ecs ect eec eee eek eeo eer ees eet eic eie eii eik eio eir eis eit ekc eke eki eko ekr eks ekt eo- eoc eoe eoi eok eoo eor eos eot erc ere eri erk ero err ers ert es- esc ese esi esk eso esr ess est etc ete eti etk eto etr ets ett icc ice ici ick ico icr ics ict ie- iec iee iei iek ier ies iet iic iie iii iio iir iis iit ikc ike iki ikk iko ikr iks ikt io- ioc ioe ioi ioo ior ios iot ir- irc ire iri irk iro irr irs irt is- isc ise isi isk iso isr iss ist itc ite iti itk ito its itt k-t kcc kce kci kck kcr kcs kct ke- kec kee kei kek keo ker kes ket kic kie kii kik kio kir kis kit kkc kke kki kkk kkr kks kkt koc koe koi kok koo kor kos kot krc kri krk kro krr krs krt ksc kse ksi ksk kso ksr kss kst ktc kte ktk kto ktr kts ktt o-i oc- occ oci ock oco ocr ocs oct oec oee oei oeo oer oes oet oic oie oii oik oio oir ois oit okc oke oki okk oko okr oks oo- ooc ooi ook ooo oor oos oot or- orc ore ori ork oro orr ors ort os- osc ose osi osk oso osr oss ost ot- otc ote oti otk oto otr ots ott rcc rce rci rco rcr rcs rct re- rec ree rei rek reo rer res ret ric rie rii rik rio rir ris rit rkc rke rkk rko rks rkt roc roe roi rok roo ror ros rot rrc rri rrk rrr rrs rrt rsc rse rsi rsk rso rsr rss rst rtc rte rti rtk rto rtr rts rtt scc sce sci sck sco scr scs sct se- sec see sei sek seo ser ses set sic sie sii sik sio sir sis sit sk- skc ske ski skk sko skr sks skt soc soe soi sok soo sor sos sot sr- src sre sri srk sro srr srs srt ss- ssc sse ssi ssk sso ssr sss sst stc ste sti stk sto str sts stt tcc tce tci tck tco tcr tcs tct te- tec tee tei tek teo ter tes tet tic tie tii tik tio tir tis tit tkc tke tkk tko tkr tks tkt to- toc toe toi tok too tor tos tot trc tre tri trk tro trr trs trt tsc tse tsi tsk tso tsr tss tst ttc tte tti ttk tto ttr tts ttt